Sorry if me message there sounded short, that was not my intention. I simply wanted to inform you of the plugin that would do exactly what you were asking.
There is some documentation on how to use the location plugin too, for the future.
Mind you, you can do this is āCentral GUI Server->Storage Nodes aboutā layout, or really however you feel appropriate for your environment.
Location plugin will likely get an overhaul in the next few years (yes years) with more automating of how to select which storage nodeās based on subnets/ip ranges, but for now itās completely manual (and thus extremely granular too).
https://wiki.fogproject.org/wiki/index.php?title=Location_Plugin